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System for storing electric energy by means of low-temperature cold energy and operating method of system

An energy storage system and cold energy technology, applied in the direction of energy storage, greenhouse gas reduction, heat storage equipment, etc., can solve the problems of low energy storage conversion efficiency, adverse effects of power grid, instability, etc., and achieve high conversion efficiency and use The effect of long life and low cost

Active Publication Date: 2015-12-23
中储国能(北京)技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The invention discloses a new type of energy storage system and its operation method that utilizes low-temperature cold energy to store electric energy, and the method effectively solves the problem of low conversion efficiency of traditional energy storage by utilizing low-temperature cold energy storage
This energy storage system has the characteristics of high efficiency, low cost, long service life, and is not restricted by geographical conditions. Instability and other factors lead to adverse effects of its power generation on the grid

Method used

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  • System for storing electric energy by means of low-temperature cold energy and operating method of system
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  • System for storing electric energy by means of low-temperature cold energy and operating method of system

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Embodiment 1

[0046] like figure 1 Shown is Embodiment 1 of the system for storing electric energy with low-temperature cold energy of the present invention, including an energy storage circuit 102, an energy release circuit 103 and a solar heat storage subsystem.

[0047] figure 1 The energy storage circuit shown includes: expander 1, cold energy storage 2, first-stage compressor 3, first-stage compressor heat exchanger 4, second-stage compressor 5, and second-stage compressor heat exchanger 6 , The third stage compressor 7 and the third stage compressor heat exchanger 8. Working gas such as figure 1 Cycle through these components as indicated by the solid lines with arrows in . The rotating shaft of the electric motor 9 is connected with the rotating shafts of the expander 1 and the compressors 3, 5, 7. Furthermore, cooling liquids 18, 19, 20 are connected in heat exchangers 4, 6, 8, respectively.

[0048] The operation process of the energy storage cycle is as follows: firstly, the ...

Embodiment 2

[0053] like figure 2 Shown is Embodiment 2 of the system of low-temperature cold energy storage electric energy coupled with wind power generation of the present invention, including an energy storage loop 104, an energy release loop 103 and a solar heat storage subsystem.

[0054] figure 2 The energy storage circuit 104 shown includes: an expander 1, a cold storage 2, a first-stage compressor 3, a first-stage compressor heat exchanger 4, a second-stage compressor 5, and a second-stage compressor heat exchanger 6. The third stage compressor 7 and the third stage compressor heat exchanger 8. Working gas such as figure 1 Cycle through these components as indicated by the solid lines with arrows in . The wind wheel 25 of the wind power generation system is connected with a gearbox 26 , and the rotating shaft of the gearbox 26 is connected with the rotating shafts of the expander 1 and the compressors 3 , 5 , and 7 . Furthermore, cooling liquids 18, 19, 20 are connected in h...

Embodiment 3

[0057] like image 3 Shown is Embodiment 3 of the system in which low-temperature cold energy storage electrical energy is coupled with industrial waste heat and waste cold energy according to the present invention, including an energy storage circuit 102 and an energy release circuit 105 .

[0058] The gas circulation during the energy storage cycle of embodiment 3 is the same as the energy storage cycle of embodiment 1. In the energy storage cycle, the work done by the motor 9 and the expander 1 jointly drives the compressor unit 101 to run, and the electric energy consumed is the difference between the power consumed by the compressor and the work produced by the expander, and what is stored is the cold energy in the cold storage 2 . In addition, during the energy storage cycle and the interval of charging / discharging, the industrial residual cold fluid 23 from liquefied natural gas or air separation system enters the cold energy storage 2, and the low-temperature cold ene...

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Abstract

The invention discloses a novel energy storage system for storing electric energy by means of low-temperature cold energy and an operating method thereof and relates to energy storage techniques. During energy storage, the system consumes electric energy to drive a compressor unit I with stage intercooling and an expansion unit I with stage intercooling, so that the low-temperature cold energy is generated and stored in a low-temperature cold energy storage device; during energy releasing, after the low-temperature cold energy in the cold energy storage device is absorbed by working fluid, the pressure is increased after the working fluid passes through a compressor unit II, and after stored solar energy or industrial waste heat is absorbed through a high-temperature heat exchanger, a power generator is driven through an expansion unit II to generate power. The novel energy storage system for storing the electric energy by means of the low-temperature cold energy has the advantages that cost is low, the thermoelectric conversion efficiency is high, the system is suitable for various power stations including power stations based on the renewable energy sources such as solar energy and wind energy, no greenhouse gas is generated, and waste heat at medium and low temperature (heat value) can be recovered.

Description

technical field [0001] The invention relates to the field of green energy technology. Based on the organic integration of low-temperature cold energy storage, heat storage and power cycle, a new energy storage system and its operating method can effectively realize the efficient storage and utilization of electric energy, renewable energy, heat energy and cold energy. Background technique [0002] With the increasing popularity of renewable energy (wind energy, solar energy, etc.), and the urgent need for grid peak regulation, improving grid reliability, and improving power quality, the importance of power energy storage systems has become increasingly prominent. Large-scale power energy storage technology can effectively solve the contradiction between peak and valley differences in power production and use; it can solve the instability of intermittent energy generation such as wind power, solar energy, and tidal energy; when a distributed energy system encounters a local li...

Claims

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Application Information

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IPC IPC(8): F01K23/00F28D20/00F28D20/02
CPCY02E60/14Y02E70/30
Inventor 王亮陈海生徐玉杰林曦鹏谢宁宁盛勇
Owner 中储国能(北京)技术有限公司
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